Warning: foreach() argument must be of type array|object, bool given in /var/www/html/web/app/themes/studypress-core-theme/template-parts/header/mobile-offcanvas.php on line 20

Customer satisfaction A department store mails a customer satisfaction survey to people

who make credit card purchases at the store. This month, 45000people made credit card

purchases. Surveys are mailed to 1000of these people, chosen at random, and 137people

return the survey form. Identify the population and the sample.

Short Answer

Expert verified

Population: The 45000people who used their credit cards to make purchases.

Sample: The 137people who replied to the survey were used as a sample.

Step by step solution

01

Given information

We have to find the population and the sample.

02

Explanation

A sample survey picks a group of people from a larger group of people about whom we wish to learn more.The 45000people who used their credit cards to make purchases..The 137people who replied to the survey were used as a sample.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Pricey pizza- The cost of a meal might affect how customers evaluate and appreciate food. To investigate, researchers worked with an Italian all-you-can-eat buffet to perform an experiment. A total of139 subjects were randomly assigned to pay either\(4 or\)8 for the buffet and then asked to rate the quality of the pizza on a9-point scale. Subjects who paid \(8 rated the pizza11% higher than those who paid only\)4.

Identify the explanatory and response variables, the experimental units, and the treatments.

Got deodorant? A group of students wants to perform an experiment to determine

whether Brand Aor Brand Bdeodorant lasts longer. One group member suggests the

following design: Recruit 40student volunteersโ€”20male and20female. Separate by

gender, because male and female bodies might respond differently to deodorant. Give all

the males Brand Adeodorant and all the females Brand B. Have the principal judge how

well the deodorant is still working at the end of the school day on a 0to 10scale. Then

compare ratings for the two treatments.

a. Identify any flaws you see in the proposed design for this experiment.

b. Describe how you would design the experiment. Explain how your design addresses

each of the problems you identified in part (a).

A louse-y situation A study published in the New England Journal of Medicine compared two medicines to treat head lice: an oral medication called ivermectin and a topical lotion containing malathion. Researchers studied 812 people in 376 households in seven areas around the world. Of the 185 households randomly assigned to ivermectin, 171 were free from head lice after 2 weeks, compared with only 151 of the 191 households randomly assigned to malathion.

a. Calculate the difference (Ivermectin โ€“ Malathion) in the proportion of households that were free from head lice in the two groups.

One hundred trials of a simulation were performed to see what differences in proportions would occur due only to chance variation in the random assignment, assuming that the type of medication doesnโ€™t matter. The results are shown in the dotplot.

b. There is one dot at 0.09. Explain what this dot means in this context.

c. Use the results of the simulation to determine if the difference in proportions from part (a) is statistically significant. Explain your reasoning.

Frozen batteries Will storing batteries in a freezer make them last longer? To find out, a company that produces batteries takes a random sample of 100 AA batteries from its warehouse. The company statistician randomly assigns 50 batteries to be stored in the freezer and the other 50 to be stored at room temperature for 3 years. At the end of that time period, each batteryโ€™s charge is tested. Result: Batteries stored in the freezer had a significantly higher average charge. What conclusion can we draw from this study? Explain your reasoning.

Running red lights An SRS of 880 drivers was asked: โ€œRecalling the last

ten traffic lights you drove through, how many of them were red when you entered the

intersections?โ€ Of the 880 respondents, 171 admitted that at least one light had been red.

A practical problem with this survey is that people may not give truthful answers. Explain

the likely direction of the bias.

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free